Year	Percent
1950	5.6462
1955	8.72725
1960	11.30548
1965	12.05296
1970	12.57809
1975	11.96854
1980	11.51282
1985	10.40678
1990	9.26056
1995	9.93619
2000	10.44985
2005	10.25784
2010	9.41461
2015	8.48843
2020	7.99499
2025	7.72506
2030	7.52052
2035	7.21779
2040	6.82659
2045	6.43798
2050	6.1148
2055	5.89683
2060	5.74887
2065	5.59991
2070	5.41225
2075	5.21392
2080	5.04387
2085	4.93813
2090	4.87473
2095	4.82892
2100	4.77604